Leather-skiving machine.



Patented Nov. :4, I899.

G.'H. BA'YLEY. LEATHER SKI'VING MACHINE.

(Application filed Aug. 16, 1898.)

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LEATHER SKIVING MACHlNE;

(Application filed Aug. 16, 189B.)

3 Sheets-Sheet 3,

(No Model.)

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U ITED STATES PATENT OFFIC CHARLES H. BAYLEY, OF BOSTON, MASSACHUSETTS.

LEATHER-SKIVING MACHINE.

SPECIFICATION forming part of Letters Patent No. 636,942, dated November 14, 1899. Application filed August 16 1898. Serial No. 688,701. (llo model.)

T aZZ whom it may concern.-

- of Boston, in the county of Sufiolk'and State of Massachusetts, have invented certain new and useful Improvements in Leather-Skiving Machines, of which the following is a description sufficiently full, clear, and exact to enable those skilled in the art to which it appertains or with which it is most nearly connected to make and use the same.

' This invention has relation to that kind or class of machines for skiving leather which are equipped with a rotary feed-roll, a rotary cutter, and a feed-disk capable of rotation, in conjunction with means adapted to cooperate with the parts specified in order to render them efficient in the performance of their designed functions.

It is the object of the present invention to provide improved means for adjusting the knife carrying frame or bracket so as to bring the knife in a position parallel with the feed-roll or tilt or incline it to any desired degree with reference to the surface of the feedroll in order to vary the line of ski'ving cut.

of the knife accordingly. In carrying out this purpose of the invention I have kept in View the fact that it is very diflicult for op erators generally, as machines heretofore have been constructed, to secure that nice or exact degree of adjustment of the knife that is essential to perfect work and to accomplish such adjustment readily and-quickly, so as to save time and tax on the patience of the operator.

Again, the invention consists of improvements whereby the grinder for the knife may be adjusted coordinately with the knife it: self, so that the grinder may always retain the same relative position with respect to the knife.

Reference is to be had. to the annexed drawings, and to the letters marked thereon, forming a part of this specification, the same letters designating the same parts or features, as the case may be, wherever they occur.

Of the drawings, Figure 1 is a front elevation of a skiving-machine embodying my'invention.

same. Fig. 3 is a horizontal sectional view Fig. 2 is an end elevation of the the varying tilts of the knife are effected.

Fig. 4 is a vertical sectional view showing the manner of adjusting the knife vertically. Fig. 5 is a similar view showing the manner of adjusting the grinder vertically. Fig. 6 is a front view of the adjustable-gear-guard detached. Fig. 7 is another View of the adj ustable guard.

In the'drawings, a designates the bed-plate or base of the machine, which is supported upon suitable legs.

b is the driving-shaft, supported in suitable bearings connected with certain parts of the frame and transmitting motion through suitable gearing and the shaft 0 to the feed-roll shaft 01.

e is the feed-roll, secured upon the shaft d. The bearings for the feed-roll shaft are supported upon a plate or bar f, pivoted at 9 upon the bed a, and at its front end is adjustable horizontally through the medium of an adjusting thumb-screw h, operating in bearings of a lug 'i, projecting from the bedplate.

j is the feed-disk, secured to the lower end of its shaft, which is held down with springs or yielding pressure.

is is the cutting-disk or knife, secured at its lower end upon a rotary shaft Z, the latter being provided at its upper end with a bevel: pinion m, which meshes with a bevel-gear n on the driving-shaft b. The cutter-shaft l is supported in suitable bearings connected with the forward'end of the knife frameor bracket '0, which latteris pivoted at 19 upon the sliding frame or block q, supported on suitable ways connected with a stationary part of the frame 0", all as is most clearly shown in Fig. 3. The frame 0" is provided with a slot .9, through which the shank of a thumb-screw t passes, said thumb-screw being tapped into the block q, so, as to hold the latter firmly in place when once it is adjusted in desired position.

The frame or bracket 0 is provided with a slot it toward its rear end, which slot is made circular and concentric with the pivotal axis 19, and the rear end of the frame 0 is also made in the form of a segment of a wormgear provided with worm-teeth'o, as shown in Fig. 1. The shank of a thumb-screw w passes through the slot at in the bracket or frame 0 and is tapped into the block or sliding frame q. Under this construction it will be seen that the knife frame or bracket 0 may, after the thumb-screww is loosened, be tipped so as to incline the knife 7a to any desired position in order to vary the angle of the skiving cut made upon the leather passing over the feed-roll e and under the feed-disk and operated upon by the knife in a well-known way.

In order to secure the adjustment of the knife with great nicety, I have provided a worm or screw 03, arranged to be supported in the rear angle end or shank of the block q and to engage the worm-segment or toothed rear end o of the frame 0. \Vith this construction it will be seen that upon loosening the thumb-screw w the bracket 0 will not be displaced, but will remain in position until the adjusting screw or Worm 00 is operated, which may be taken hold of by the thumb and finger of the operator on the milled head 1 and after the bracket is adjusted so as to adjust theinclination of the knife to the exact line desired the thumb-screw will be turned up and the bracket held in position.

To adjust the knife to and fro on a line substantially parallel with the axis of the driving-shaft and feed-disk shaft, it will be necessary to loosen the thumb-screw t and move the frames supporting the bracket to position, resetting the said thumb-screw after the adjustment is made.

By forming the end of the bracket or frame 0 as a segment of a worm-gear and providing it, of course, with worm-teeth, and by making a bearing for the worm or, which engages the segment of the bracket 0, in an angular forwardly-projecting parts of the block or sliding frame, I am enabled to economize space and get the adjusting means for the knifecarrying frame or bracket in the most convenient place and position for the operator to act upon them, and besides this an entirely eflicient means is provided for securing the angular adjustment of the knife with the utmost nicety and holding the bracket in place after adjustment.

a designates the grinder or grinding-disk, secured upon the lower end of its shaft 1), supported in suitable bearings in a bracket 0, which extends upwardly back of or to the rear of the means for supporting the cuttingknife, and parts thereof extend under the last-mentioned means and upward, as at 61, so as to be secured, as shown in Fig. 1, to the knife-carrying frame 0. By this means it will be seen that the grinder a, when once adjusted to a plane corresponding to that of the knife, will be adjusted coordinate with it when the knife-carrying frame is adjusted, since the frame carrying the grinder a is adapted to and can be made substantially one with the bracket or frame 0. This adjustment of the grinder-frame with the knife-carrying frame is also an important feature of the invention. It will be noted that the grinder-frame is pivoted upon the screw-stud 1) and that to the rear of the same said grindercarrying frame is provided with a slot 9, through which passes the shank of a set-screw f, tapped into the knife-carrying frame 0, so in addition to the adjustments of the grinder before described it may be adjusted in inclined position independent of the knife through the medium of the set-screwf' and the slot 0' in the grinder-bracket.

g" designates a gear guard or hood, made in circular form and adapted to extend over the teeth of the gear a and in an extended part g to also project outward in front of the gear on. The said guard g is provided with a supporting-shank h, through which is formed a slot 71 for the reception of the shank of a setscrew j, adapted to be tapped into the stationary part *1 of the frame, so as to hold it in position and allow it to be adjusted longitudinally of the driving-shaft when the gear 12 is adjusted, as it sometimes is, upon the driving-shaft.

By means of the guard 9 all danger of any accident to the operator from his or her fingers or her hair being caught in the gears or any other accident happening to the operator is avoided, and besides this the gears are kept free from being clogged by dust, dirt, or other foreign matter, and by rendering the guard adjustable upon the driving-shaft provision is made for keeping it in position relatively to the gear, so as to best subserve its purpose as a guard for the said gears.

Then it is desired to employ the grinder in sharpening the knife, the belt tightening means are adjusted so as to turn the grinder and the thumb-screw Z on top of the grinder-shaft I) adjusted so as to bring the grinder in contact with the knife, and after the knife is ground the grinder will be raised and the belt-tightening means adjusted so as to slacken the belts which operate the grinder, and the use of the machine may be proceeded with.

It is to be particularly noted that the grinder is placed in the rear of the skiving mechanism and entirely out of the way of the latter and of the material as it is being operated upon. At the same time the grinding means is so located and is of such an accessible nature that it may be readily and quickly brought into position when desired.

This invention relates to the adjustment and control of the rotary knife-carrying shaft so as to regulate the angular position of the knife relatively to the bed or feed roll, so as to scarf the margin of pieces of leather on a greater or less angle or abruptness of bevel. It is very difficult in machines in the class to which these improvements relate to adjust the knife with the requisite nicety, and it has been a problem that has required long and industrious study, expense, and labor to accomplish.

Having thus explained the nature of theinvention and described a way of constructing and using the same, though without attempting to set forth all of the forms in which it may be made or all of the modes of its use, it is declared that What is claimed is 1. A skiving-machine embodying in its con struction a feed bed or roll, the frame, a block having a sliding connection relatively to the frame, a pivoted bracket on the block, a knife carried by the bracket and operating at an carried by the bracket and operating at an angle with respect to the surface of the feedroll, a screw carried by the block for effecting a tilting adjustment of the former and the knife, and a screw between the bracket and block for fixing the former in adjusted position.

3. The sliding block q and its screw-shank bearing, combined with the knife-carrying frame or bracket provided with a screwthread, and a screw inthe said screw-shank bearing adapted to engage the thread of the knife-bracket.

4. A skiving-machine embodyi'ngin its construction a feed bed or roll, a knife-carrying bracket adapted to be tilted to vary the inclination of the knife with respect to the surface of the bed or roll, the machine-frame,

and means intermediate of the frame and the bracket f r the adjustment of the latter in a direction longitudinally of the feed-roll, a device carried by the means intermediate of the frame and bracket for effecting a tilting ad- 40 justment of the said bracket, and means forsecuring the latter in adjusted tilted position. b 5. A skiving-machine embodying in its construction a feed or bed roll, the frame, a block slidingly adjustable on the frame, a bracket pivoted on the block and a rotary knife carried thereby and operating at an angle with respect to the feed or bed roll, the said bracket being formed at a point as a toothed or threaded segment of a circle concentric to its pivot, and a screw or worm supported by the block to engage the said teeth or thread to tilt the bracket and knife at any desired angle relatively to the surface of the feed or bed roll, and means for fixing the bracket and knife in adjusted position.

6. A skiving-machine embodying in its construction a feed or bed roll, the frame, a block slidingly adjustable onthe frame, a bracket pivoted on the block and a rotary knife carried thereby operating at an angle with respect to the surface of the feed or bed roll, and a screw or worm supported by the block to engage the bracket to adjust the angle of the knife relatively to the surface of the feed or bed roll, and means for holdingthe bracket in adjusted position, combined with a grinding device and its support, the latter being connected with the said bracket and movable and adjustable coincident with it.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 13th day of July, A. D..1898.

CHARLES H. BAYLEY.

Witnesses:

ARTHUR W. ORossLEY, GEO. N. GODDARD. 

